LightPIT: src/java/de/uapcore/lightpit/modules/LanguageModule.java@8137ec335416

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  *

     4  * Copyright 2018 Mike Becker. All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions are met:

     8  *

     9  *   1. Redistributions of source code must retain the above copyright

    10  *      notice, this list of conditions and the following disclaimer.

    11  *

    12  *   2. Redistributions in binary form must reproduce the above copyright

    13  *      notice, this list of conditions and the following disclaimer in the

    14  *      documentation and/or other materials provided with the distribution.

    15  *

    16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    26  * POSSIBILITY OF SUCH DAMAGE.

    27  *

    28  */

    29 package de.uapcore.lightpit.modules;

    31 import de.uapcore.lightpit.LightPITModule;

    32 import de.uapcore.lightpit.AbstractLightPITServlet;

    33 import de.uapcore.lightpit.Constants;

    34 import de.uapcore.lightpit.Functions;

    35 import de.uapcore.lightpit.HttpMethod;

    36 import javax.servlet.annotation.WebServlet;

    37 import javax.servlet.http.HttpServletRequest;

    38 import javax.servlet.http.HttpServletResponse;

    39 import de.uapcore.lightpit.RequestMapping;

    40 import de.uapcore.lightpit.ResponseType;

    41 import java.util.ArrayList;

    42 import java.util.IllformedLocaleException;

    43 import java.util.List;

    44 import java.util.Locale;

    45 import java.util.Optional;

    46 import javax.servlet.ServletException;

    47 import org.slf4j.Logger;

    48 import org.slf4j.LoggerFactory;

    51 @LightPITModule(

    52         bundleBaseName = "de.uapcore.lightpit.resources.localization.language",

    53         modulePath = "language"

    54 )

    55 @WebServlet(

    56         name = "LanguageModule",

    57         urlPatterns = "/language/*"

    58 )

    59 public final class LanguageModule extends AbstractLightPITServlet {

    61     private static final Logger LOG = LoggerFactory.getLogger(LanguageModule.class);

    63     private final List<Locale> languages = new ArrayList<>();

    65     @Override

    66     public void init() throws ServletException {

    67         super.init();

    69         Optional<String[]> langs = Functions.availableLanguages(getServletContext());

    70         if (langs.isPresent()) {

    71             for (String lang : langs.get()) {

    72                 try {

    73                     Locale locale = Locale.forLanguageTag(lang);

    74                     if (locale.getLanguage().isEmpty()) {

    75                         throw new IllformedLocaleException();

    76                     }

    77                     languages.add(locale);

    78                 } catch (IllformedLocaleException ex) {

    79                     LOG.warn("Specified lanaguge {} in context parameter cannot be mapped to an existing locale - skipping.", lang);

    80                 }

    81             }

    83         } else {

    84             languages.add(Locale.ENGLISH);

    85             LOG.warn("Context parameter 'available-languges' not found. Only english will be available.");

    86         }

    87     }

    89     @Override

    90     public void destroy() {

    91         super.destroy();

    92         languages.clear();

    93     }

    95     @RequestMapping(method = HttpMethod.GET)

    96     public ResponseType handle(HttpServletRequest req, HttpServletResponse resp) {

    98         req.setAttribute("languages", languages);

    99         req.setAttribute("browserLanguage", req.getLocale());

   101         setStylesheet(req, "language");

   102         setDynamicFragment(req, "language");

   103         return ResponseType.HTML_FULL;

   104     }

   106     @RequestMapping(method = HttpMethod.POST)

   107     public ResponseType switchLanguage(HttpServletRequest req, HttpServletResponse resp) {

   109         Optional<Locale> chosenLanguage = Optional.ofNullable(req.getParameter("language"))

   110                 .map(Locale::forLanguageTag)

   111                 .filter((l) -> !l.getLanguage().isEmpty());

   113         chosenLanguage.ifPresent((l) -> req.getSession().setAttribute(Constants.SESSION_ATTR_LANGUAGE, l));

   114         chosenLanguage.ifPresent(resp::setLocale);

   116         return handle(req, resp);

   117     }

   118 }

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